Under Armour has been an industry leader in highly stretchable and moisture wicking athletic material for years, and their first dive into the tennis industry has been a huge success. By signing Andy Murray, the distinguished brand brought excellence to their tennis apparel line as they have done with other sports. Though many brands try to emulate the Under Armour technology, the original HeatGear remains the best in warm-weather performance. At this point in the brand's life, they offer clothes not just for the summer, but the winter, fall, and rainy days as well.